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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98f2b4a36b2c43ac0266a973b50b1c341c35a5a23b519068720b6b52c9ef16ca' 
  AND token = '+f/0bauZBcPog90UGbYBbRtBfmn0LTNcs4qElxAoYpY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}